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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Deferred Tax Assets, Valuation Allowance, Total | $ 50,548 | $ 41,281
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 9,200 |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 2,500 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 2,000 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 0 | $ 1,100
Domestic Tax Authority [Member] |  |
Tax Credit Carryforward, Amount | 15,600 |
Operating Loss Carryforwards, Total | $ 559,800 |
Open Tax Year | 2011 2012 2013 |
State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards, Total | $ 1,088,500 |
Open Tax Year | 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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